Patent GB-464746-A (GB)
Abstract: 464,746. Calculating-apparatus. GARDNER CO. Sept. 22, 1936, No. 25760. Convention date, Oct. 2, 1935. [Class 106 (i)] In a machine with reciprocatory differential actuators the control of the engagement and disengagement of the totalizer therewith is effected by an arm movable with the actuators and provided with a roller, a lever controlling the movement of the totalizer shaft and provided with a guide flange co-operating with the roller, and an adjustable switch cam pivotally mounted on the lever and co-operating with the roller to rock the lever and control the totalizer movement. The invention is shown applied to a machine of the Gardner type with a totalizer 473, Figs. 1 and 2, and reciprocatory actuating segments 610 controlled differentially by notched bars 615 co-operating with the stems of the depressed keys. Movement is imparted to the actuators by operating a rock-shaft 301 and the engagement of the totalizer with the actuators is controlled bv a cam plate 419 bearing on the slidably mounted shaft 403 of the totalizer. The timing of the engagement movement is governed by the manual setting of a control lever 3. Connected with the cam plate 419, through a U-spring connection 4 is an arm 5 formed at its rear end with a flange 22, Fig. 6, and having pivoted thereon a switch cam plate 6, Figs. 1 and 5, for co-operation with a roller 7 on a full stroke segment 8. The plate 6 has an extension 9 passing through a slot in the arm 5 and between two spring pressed arms 10, 11 loose on the hub of the full stroke segment. The arms 10, 11 have extensions engaging the lower end of a rock lever 14 pivoted on a shaft 15 and normally held by spring means against a stop pin 69. Projections 31, 38, on the rock lever co-operate with projections 30, 37 on the bifurcated end of a link 16 pivoted to the lower end of the control lever 3. In the normal or adding position of the lever 3 as shown in Fig. 1 the rock lever 14 and arms 10, 11 hold the cam 6 against a projection 20 on the arm 5 with the rear surface of the cam in the path of movement of the roller 7. During the first portion of the forward movement of the operating handle 1 the roller 7 is caused to pass under the cam 6 to engage the lower surface of the flange thereby raising the arm 5 and rocking the cam plate 419 so as to allow the totalizer shaft under spring action to be disengaged. At the end of the movement the roller 7 passes beyond the flange 22 and lies adjacent the forward surface of the cam 6, and during the return movement acts to restore the arm 5 and re-engage the totalizer. For a subtraction operation the lever 3 is set rearwardly and the link 16 through the projection 30 imparts a clockwise movement to the rock lever 14 which through the arms 10, 11 rocks the cam 6 to move the rear surface out of the path of the roller 7 so that on the forward stroke the roller passes idly over the flange and the totalizer remains in engagement. During the return movement the roller is forced by the forward surface of the cam 6 beneath the flange 22 and the arm 5 is raised to disengage the totalizer, and finally the arm 5 is restored by the roller 7 engaging a projection 35 on the arm. In non-add operations the lever 3 is moved forwardly and the link 16 rearwardly so as to position the rock lever 14 and cam 6 in a neutral position so that the roller 7 moves idly during the forward and backward stroke of the operating handle. In this operation the totalizer remains in engagement in both directions of travel. Totals and sub-totals. The taking of a total involves a subtractive setting of the machine the total key 278 has a projection 54 adapted to engage a pin 55 on the rock lever 14 so as to set the cam 6 to its subtractive position. For sub-total taking purposes the sub total key 273 is formed with a projection 56 that co-operates with a projection 57 of the rock lever 14 to set the cam 6 in non-add position. Power operation. Depression of the starting bar 138, Fig. 7, rocks a latch 147 to free a lever 150 which under spring action rocks to free the pawl 153 of a one revolution clutch mechanism 157. At the same time an insulated roller 63 on the lever 150 closes the contacts 64 of the motor circuit. An interlock is provided between the starting bar 138 and the control lover 3 comprising a notched extension on the lever 3 and a pivoted arm 60 with which engages the stud 59 of the roller 63. A projection 62 co-operates with the notch 71. If the lever 3 has been partially displaced the projection 62 engages one or other of the surfaces 66 and prevents further movement of the lever 150. Projections 67 on the surfaces insure that the lever must be correctly set before the machine can operate.